EP0226321A2 - Appareil pour la coulée contre la gravité - Google Patents

Appareil pour la coulée contre la gravité Download PDF

Info

Publication number
EP0226321A2
EP0226321A2 EP86308623A EP86308623A EP0226321A2 EP 0226321 A2 EP0226321 A2 EP 0226321A2 EP 86308623 A EP86308623 A EP 86308623A EP 86308623 A EP86308623 A EP 86308623A EP 0226321 A2 EP0226321 A2 EP 0226321A2
Authority
EP
European Patent Office
Prior art keywords
mould
vacuum
molten metal
sites
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86308623A
Other languages
German (de)
English (en)
Other versions
EP0226321B1 (fr
EP0226321A3 (en
Inventor
Karl D. Voss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of EP0226321A2 publication Critical patent/EP0226321A2/fr
Publication of EP0226321A3 publication Critical patent/EP0226321A3/en
Application granted granted Critical
Publication of EP0226321B1 publication Critical patent/EP0226321B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould

Definitions

  • This invention relates to apparatus for the vacuum, countergravity casting of metal in gas-permeable, shell moulds and, more particularly, to means for mounting the mould to the vacuum chamber used therewith.
  • the vacuum, countergravity, shell mould casting process is particularly useful in the making of thin-walled castings and involves: sealing a bottom-gated mould, having a gas-permeable upper portion to the mouth of a vacuum chamber so that the chamber confronts the upper portion; immersing the underside of the mould in an underlying melt; and evacuating the chamber to draw melt up into the mould through one or more gates in the underside thereof.
  • a process is shown in US-A-4,340,l08 wherein the mould comprises a resin-bonded-sand shell having an upper cope portion and a lower drag portion sealingly bonded together and attached to the vacuum chamber by means of spring clips which engage a peripheral abutment on the outside of the vacuum chamber.
  • US-A-4,340,l08 seals the mould to the vacuum chamber on top of the cope so that the parting line between the mould halves lies outside the vacuum chamber.
  • Copending European patent application Serial No. 86307265.8 seals the mould to the vacuum chamber on top of the drag so that the parting line between the cope and drag falls within the vacuum chamber.
  • Spring-biased bolts are used which engage the underside of the drag and extend along the outside of the vacuum chamber to secure the mould to the vacuum chamber. The heads of the bolts are immersed in the melt and accordingly have a very short useful life.
  • Chandley G.D. Automatic Counter Gravity Casting of Shell Moulds , Modern Casting, October l983, pages 29-3l, describes a technique for mounting round moulds to a round vacuum chamber wherein the inside surface of the vacuum chamber includes self-tapping threads which screw into the periphery of the round mould.
  • the latter technique has been restricted to relatively small moulds and cannot be used with moulds which are rectangular or have other than a round exterior.
  • the invention comprehends an improved vacuum, countergravity casting apparatus including: a mould having a porous, gas-permeable upper shell and a bottom-gated lower portion secured to the upper shell; a vacuum box defining a chamber confronting the upper shell for evacuating the mould through the shell, which box comprises a peripheral wall having a lip on the underside thereof for sealingly engaging the mould and a ceiling overlying the mould; a plurality of threadable mounting sites on top of the mould; and retainer means reciprocably slidable through the ceiling of the box, said retainer means comprising a plurality of shafts extending sealingly through the ceiling, self-tapping threads on the lower end of each shaft engaging a mounting site registered therewith, and a means for rotating each shaft so as to screw the threads into engagement/disengagement with the mounting site as is appropriate for mounting and demounting the mould to the vacuum chamber.
  • the mounting sites each comprise an upstanding lug and the lower end of the shaft comprises an inverted cup having female threads on the inside thereof for threading onto the outside surface of the lugs.
  • the lower end of each shaft is provided with a male threaded tip for screwing into the mounting site.
  • the mounting site may be an upstanding lug similar to that of the first embodiment, or may simply be a location on the main body of the mould where the threaded tip can burrow into the mould without upsetting the moulding cavity.
  • a rotator e.g., air motor
  • a rotator on the other end of the shaft causes the shaft to rotate in the desired direction for screwing the threads onto/into the mounting sites so as to draw the mould up into sealing engagement with the mouth of the vacuum chamber.
  • Figures l, 2 and 3 are side, sectioned views through different embodiments of a vacuum, countergravity metal casting apparatus in accordance with the present invention.
  • Figures l, 2 and 3 differ one from the other only with respect to the precise nature of the mounting sites used to anchor the mould to the vacuum chamber. Accordingly, like reference numerals are used for like parts in all three Figures and different reference numerals are used only where the Figures differ from each other.
  • the various Figures show a pot 2 of metal melt 4 which is to be drawn up into the mould 6.
  • the mould 6 includes gas-permeable, upper portions 8 and 8′ joined (e.g., glued) to a lower portion l0 along parting lines l2 and l2′ and define therebetween separate moulding cavities l6 and l6′.
  • the lower portion l0 includes a plurality of ingates l4 on the underside thereof for supplying melt to the mould cavities l6 and l6′ when the cavities are evacuated.
  • the lower portion l0 of the mould 6 is sealed to the mouth l8 of a vacuum chamber 20, which is defined by vacuum box 22, so that the gas-permeable upper portions 8 and 8′ are encompassed by the chamber 20.
  • the vacuum chamber 20 is communicated to a vacuum source (not shown) via conduit 23.
  • the upper portions 8 and 8′ of the mould 6 comprise a gas-permeable material (e.g., resin-bonded-sand) which permits gases to be withdrawn from the casting cavities l6 and l6′ when a vacuum is produced in the chamber 20.
  • the lower portion l0 of the mould 6 may conveniently comprise either the same material as the upper portions 8 and 8′, or other materials, permeable or impermeable, which are compatible with the upper portion material.
  • Pieces of angle iron 26 are welded to the inside of the walls 24 of the box 22 so as to provide a continuous, inwardly projecting shelf or lip defining the mouth l8 of the vacuum chamber 20.
  • a continuous, elastomeric gasket 28 e.g., silicone or fluoroelastomer rubber
  • is secured e.g., glued
  • the lower portion l0 of the mould 6 includes a continuous upstanding ridge 30 having an upper sealing surface 32 for engaging the elastomeric gasket 28 and compressing it against the shelf 26 when the mould 6 is secured to the vacuum box 22.
  • upstanding mounting lugs 34 are provided on top of the upper portions 8, 8′ of the mould 6, which lugs 34 are adapted to be threaded by self-tapping threads on the ends of anchoring means 36 which extend through a ceiling 38 of the vacuum chamber 20.
  • the anchoring means 36 comprises a rotatable shaft 40 having an inverted cup 42 on the lower end thereof which, in turn, has self-tapping, female threads 44 on the inside surface thereof. Upon rotation of the shaft 40, the threads are screwed into the outside surface of the respective upstanding mounting lug 34.
  • the lower end of the shaft 40 is provided with a tip 46 having male, self-tapping threads on the outside thereof which, upon rotation of the shaft 40, screw into the centre of a respective stud 48.
  • the stud 48 will preferably be pre-drilled to provide an undersized socket 49 for receiving the respective tip 46 therein and thereby reduce the risk of splitting the stud apart during engagement with the tip 46.
  • the shafts 40 for both embodiments, have motors 50 on the opposite ends thereof for rotating the shafts 40 so as to engage and disengage the threads from the mounting lugs.
  • the shaft 40 of each anchoring means 36 is slidable up or down through the centre of bearings 52 carried by a mounting bracket 54 and through a rubber (e.g., silicone) sealing grommet 56.
  • FIG. 3 The embodiment shown in Figure 3 is similar to that of Figure 2 except that the mounting studs 48 are eliminated and sockets 49′ are provided directly into the main body of the mould 6 through a top surface 58 thereof.
  • the mouth of the vacuum chamber 20 is lowered down onto the mould 6.
  • the anchoring means 36 are caused, by any convenient means (not shown), to descend into engagement with the respective lugs 34 or studs 48, registered therewith, and the shafts 40 rotated (e.g., clockwise) to screw the threads 44 or 46 onto/into the lugs 34 or studs 48 respectively and thereby draw the mould 6 up tightly against the gasket 28.
  • the shafts 40 are rotated in the opposite direction (e.g., counterclockwise) to release the mould 6.
  • the present invention has the advantages that the anchoring means used to fasten the mould to the vacuum chamber are all located within the vacuum chamber out of contact with, and protected from, the melt, and the mould can be readily attached or detached from the vacuum chamber using automation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP86308623A 1985-12-09 1986-11-05 Appareil pour la coulée contre la gravité Expired EP0226321B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US80661985A 1985-12-09 1985-12-09
US806619 1985-12-09
US06/872,010 US4658880A (en) 1985-12-09 1986-06-09 Countergravity casting apparatus
US872010 1986-06-09

Publications (3)

Publication Number Publication Date
EP0226321A2 true EP0226321A2 (fr) 1987-06-24
EP0226321A3 EP0226321A3 (en) 1987-12-09
EP0226321B1 EP0226321B1 (fr) 1989-01-11

Family

ID=27122900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86308623A Expired EP0226321B1 (fr) 1985-12-09 1986-11-05 Appareil pour la coulée contre la gravité

Country Status (5)

Country Link
US (1) US4658880A (fr)
EP (1) EP0226321B1 (fr)
BR (1) BR8606039A (fr)
CA (1) CA1262505A (fr)
DE (1) DE3661692D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635995A1 (fr) * 1988-09-02 1990-03-09 Haehne Siefried Procede de moulage d'objets, moyens en vue de la mise en oeuvre de ce procede et installations pourvues de ces moyens

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932461A (en) * 1988-01-25 1990-06-12 General Motors Corporation Countergravity casting apparatus
US4858672A (en) * 1988-05-25 1989-08-22 General Motors Corporation Countergravity casting apparatus and method
US4825933A (en) * 1988-06-24 1989-05-02 General Motors Corporation Countergravity casting apparatus
US4828011A (en) * 1988-06-24 1989-05-09 General Motors Corporation Countergravity casting apparatus
EP0352406A1 (fr) * 1988-07-15 1990-01-31 General Motors Corporation Procédé et dispositif de coulée à depression utilisant un joint d'étanchéité élastomère et une chambre sous vide refroidie
US4901781A (en) * 1988-08-30 1990-02-20 General Motors Corporation Method of casting a metal matrix composite
US4862946A (en) * 1988-11-23 1989-09-05 General Motors Corporation Vacuum countergravity casting apparatus and method
US4949774A (en) * 1989-03-27 1990-08-21 Atmosphere Group Expendable cap device to minimize dross inclusions in the vacuum casting process
US4957153A (en) * 1989-05-02 1990-09-18 General Motors Corporation Countergravity casting apparatus and method
US4971131A (en) * 1989-08-28 1990-11-20 General Motors Corporation Countergravity casting using particulate filled vacuum chambers
US5035277A (en) * 1991-01-25 1991-07-30 General Motors Corporation Counter gravity casting apparatus
US5088546A (en) * 1991-05-10 1992-02-18 General Motors Corporation Vacuum-assisted counter gravity casting apparatus with valve to prevent flow of melt from mold
US5062466A (en) * 1991-05-10 1991-11-05 General Motors Corporation Countergravity casting apparatus and method
US5062467A (en) * 1991-05-10 1991-11-05 General Motors Corporation Vacuum countergravity casting apparatus and method
US8312913B2 (en) * 2005-02-22 2012-11-20 Milwaukee School Of Engineering Casting process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4340108A (en) * 1979-09-12 1982-07-20 Hitchiner Manufacturing Co., Inc. Method of casting metal in sand mold using reduced pressure
US4508157A (en) * 1983-04-15 1985-04-02 Hitchiner Manufacturing Co., Inc. Self-tapping support for shell molds
US4616691A (en) * 1985-12-09 1986-10-14 General Motors Corporation Countergravity casting apparatus
EP0225004A2 (fr) * 1985-11-27 1987-06-10 General Motors Corporation Moule de fonderie pour la coulée à dépression

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2997756A (en) * 1956-07-17 1961-08-29 Griffin Wheel Co Method and apparatus for casting ingots

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4340108A (en) * 1979-09-12 1982-07-20 Hitchiner Manufacturing Co., Inc. Method of casting metal in sand mold using reduced pressure
US4508157A (en) * 1983-04-15 1985-04-02 Hitchiner Manufacturing Co., Inc. Self-tapping support for shell molds
EP0225004A2 (fr) * 1985-11-27 1987-06-10 General Motors Corporation Moule de fonderie pour la coulée à dépression
US4616691A (en) * 1985-12-09 1986-10-14 General Motors Corporation Countergravity casting apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635995A1 (fr) * 1988-09-02 1990-03-09 Haehne Siefried Procede de moulage d'objets, moyens en vue de la mise en oeuvre de ce procede et installations pourvues de ces moyens
EP0359611A1 (fr) * 1988-09-02 1990-03-21 Siegfried Haehne Procédé de moulage d'objets, moyens en vue de la mise en oeuvre de ce procédé et installations pourvues de ces moyens

Also Published As

Publication number Publication date
EP0226321B1 (fr) 1989-01-11
DE3661692D1 (en) 1989-02-16
CA1262505A (fr) 1989-10-31
BR8606039A (pt) 1987-09-15
US4658880A (en) 1987-04-21
EP0226321A3 (en) 1987-12-09

Similar Documents

Publication Publication Date Title
EP0226321B1 (fr) Appareil pour la coulée contre la gravité
EP0226315B1 (fr) Appareil pour la coulée contre la gravité
CN1034562C (zh) 用于铸型的可卸嵌入件及生产铸件的铸型
US4745962A (en) Countergravity casting apparatus
US5168917A (en) Casting of dental metals
GB1033066A (en) Method and apparatus for casting metal articles
EP0225004A3 (fr) Moule de fonderie pour la coulée à dépression
US4825933A (en) Countergravity casting apparatus
US4508157A (en) Self-tapping support for shell molds
US4858672A (en) Countergravity casting apparatus and method
JPH0260429B2 (fr)
US4862946A (en) Vacuum countergravity casting apparatus and method
JPS62137167A (ja) 反重力式鋳造装置
CN110340329A (zh) 一种铝及铝合金低压半连续铸造结晶器冷却系统
JP2817436B2 (ja) 吸引鋳造装置
JPS59153566A (ja) 減圧鋳造用鋳型とその取付方法
JPS5841010Y2 (ja) 連続鋳造機の酸化防止器取付装置
JPS6451915A (en) Casting mold
SU1355352A1 (ru) Опока дл вакуумной формовки
JPH0142795Y2 (fr)
JPS61180643A (ja) 減圧鋳造装置
JPH0216848Y2 (fr)
JPS61180642A (ja) 減圧鋳造方法
JPH0511013Y2 (fr)
JPH0530846Y2 (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19861117

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

17Q First examination report despatched

Effective date: 19880603

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 3661692

Country of ref document: DE

Date of ref document: 19890216

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19911028

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19911128

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19911230

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19921105

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19921105

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930730

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930803

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST